typescript-best-practices

TypeScript type safety and runtime validation are enforced by applying discriminated unions for exhaustive state handling and integrating Zod schemas as a single source of truth to validate data at trust boundaries.

The best way to validate external API responses in full-stack TypeScript is using Zod schemas as a single source of truth, strictly validating data before it enters your application logic to prevent unhandled runtime errors.

Make illegal states unrepresentable in TypeScript by using type-first architecture patterns such as discriminated unions, branded types, and exhaustive switch checks to eliminate loose typing and unhandled states.

Yes, you can use Zod for runtime validation in legacy TypeScript codebases by refactoring modules to integrate Zod schemas at trust boundaries, ensuring all possible states are handled at compile time.

You need strict mode compliance and immutable functional programming in TypeScript when designing data models and API integration layers in full-stack applications to prevent fragile and hard-to-maintain codebases.